docs: def url(self):
          """Gets the url for the resource this model represents.
  
          It will just use the 'href' passed in to the constructor if that exists.
          Otherwise, it will generated it based on the collection's url and the
          model's identifier.
          """
          if self._href is not None:
              return self._href
          if self.identifier:
              #  for some reason atlas does not use classifications here in the path when considering one classification
              path = '/'.join([self.parent.url.replace('classifications/', 'classficiation/'), self.identifier])
              return path
          raise exceptions.ClientError("Not able to determine object URL")